2003 Kawasaki KFX 50, Very clean kids quad, ready to ride! - The KFX50 is Kawasaki's child-sized ATV for riders 6-11 and older. It features an air-cooled, two-stroke engine with oil injection, single-speed automatic transmission and lightweight chain final drive. Other features include throttle limiter, ignition cut-off tether, front and rear suspension, front and rear drum brakes and a 2.6 liter fuel tank.